TM 9-4940-568-34
2-10
Table 2-3. Engine Troubleshooting (CONT).
Malfunction
Test or Inspection
Corrective Action
19. EXHAUST BLACK SMOKE EXCESSIVE.
Injectors malfunctioning.
Replace injectors (TM 9-4940-568-20).
Fuel injection pump malfunctioning or overfueled.
Replace fuel injection pump (Para 5-17).
Piston rings are not sealing (blue smoke).
Perform a compression check (Para 5-8). Correct as required (Para 7-6).
Fuel injection pump timing is incorrect.
Check and time fuel injection pump (Para 5-19).
20. EXHAUST WHITE SMOKE EXCESSIVE.
Injection pump timing is incorrectly adjusted.
Check top dead center (TDC) (Para 7-9).
Check and adjust injection pump timing (Para 5-19).
Injector is installed with more than one sealing washer.
Remove extra washer (TM 9-4940-568-20).
Injectors are malfunctioning.
Check and replace injectors (TM 9-4940-568-20).
Coolant leaking into combustion chamber.
Refer to troubleshooting logic for coolant loss (TM 9-4940-568-20).
Fuel injection pump is malfunctioning and delivery valves are malfunctioning.
Replace fuel injection pump (Para 5-17).
Cylinder head gasket leaking.
Replace cylinder head gasket (Para 5-7).
21. COOLANT TEMPERATURE ABOVE NORMAL - GRADUAL OVERHEAT.
Fuel injection pump timing is incorrect.
Verify fuel injection pump timing marks are aligned (Para 5-17).
Fuel injection pump is overfueled.
Replace fuel injection pump (Para 5-17).
